Breadcrumb Home > Thesaurus > B Synonyms of backdate Find synonyms for: Verb 1. backdate, effect usage: make effective from an earlier date; "The increase in tax was backdated to January" WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of backdate (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: terraincognita Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language